Reconciling icetexane biosynthetic connections with their chemical synthesis: total synthesis of (+/-)-5,6-dihydro-6alpha-hydroxysalviasperanol, (+/-)-brussonol, and (+/-)-abrotanone.

A unified strategy for the chemical synthesis of the icetexane diterpenoids brussonol and 5,6-dihydro-6alpha-hydroxysalviasperanol has led to a structural revision of the recently isolated natural products abrotandiol and abrotanone.